(廊坊師范學(xué)院 化學(xué)與材料科學(xué)學(xué)院，廊坊 065000)
摘 要: 采用電化學(xué)共沉積法制備了含少量氧化石墨烯(GO)的Ag@AgBr/GO/Ni表面等離子體膜電極，該膜電極的表面微觀形貌呈現(xiàn)出GO覆蓋在AgBr顆粒表面的褶皺結(jié)構(gòu)。納米Ag分布在AgBr表面以及GO 和AgBr接觸的邊緣，尺寸分布從10 nm到120 nm基本上呈正態(tài)分布趨勢(shì)，顆粒尺寸多為50~80 nm。作為光陰極Ag@AgBr/GO/Ni膜電極表現(xiàn)出優(yōu)異的催化活性和循環(huán)穩(wěn)定性，光電化學(xué)過(guò)程與暗態(tài)的電化學(xué)過(guò)程的本質(zhì)不同在于其存在光生電子由價(jià)帶躍遷至導(dǎo)帶而產(chǎn)生的光電流。在可見(jiàn)光照射和最佳陰極偏壓下，良好的光電協(xié)同效應(yīng)、GO優(yōu)異的導(dǎo)電性能和較大顆粒納米Ag增強(qiáng)的表面等離子體效應(yīng)是Ag@AgBr/GO/Ni優(yōu)異光電催化性能的主要原因。
關(guān)鍵字: Ag@AgBr/GO/Ni膜電極；表面等離子體共振；光陰極；電荷轉(zhuǎn)移機(jī)制；光電催化
（Faculty of Chemistry and Material Science, Langfang Normal University, Langfang 065000, China）
Abstract:Ag@AgBr/graphene oxide (GO)/Ni surface plasma film electrode containing a small amount of GO was prepared by electrochemical co-deposition method. The surface morphology of the film electrode shows the corrugated structure of GO covers on the surface of AgBr particles. Ag nanoparticles are distributed on the surface of AgBr and near the contact edge between the GO and AgBr. The size distribution of Ag nanoparticles ranges from 10 nm to 120 nm, showing a normal distribution trend, and the particle size is mostly 50-80 nm. Ag@AgBr/GO/Ni film electrode as photocathode has excellent photoelectrocatalytic (PEC) activity and cycle stability. A major difference between the photoelectrochemical reaction under visible light irradiation and the dark electrochemical reaction arose from photocurrent produced by the transition of a photogenerated electron from the valence band to the conduction band. Under visible light irradiation and optimum cathode bias, the good photoelectric synergistic effect, the excellent electroconductivity of GO and the enhanced surface plasmon effect of large Ag nanoparticles are the main reasons for the excellent PEC performance of Ag@AgBr/GO/Ni film electrode.
Key words: Ag@AgBr/GO/Ni film electrode; surface plasmon resonance; photocathode; charge transfer mechanism; photoelectrocatalytic
